Forced-draft system for steam-generators.



N0. 638,7l7. .Patented DBG. l2, |399.;

W. D. HOXIE. FORCED DRAFT SYSTEM FUR. STEAM GENEBATORS.

(No Model.) (Application med Apr. 24, 1899.) v2 Sheets-Sheet l.

n Oo 0G` ooooooooo ixwnw Patented Dec. I2, |899.

No. 633,7l7.

w. n. Home. FORCED DRAFT SYSTEII FOR .STEAM GENERATORS.

(No Model.) (Application filed Apr 24, 1899A 2 Sheets-Sheet 2.

"ATENT Erica.

UNITED STATES IVILLIAM D. IIOXIE, OF NFV YORK, N. Y., ASSIGNOR TO THE BABOOCK t WILOOX COMPANY, OF SAME PLACE.

FORCED-DRAFT SYSTEM FOR STEAM-GENERATORS.

SPECIFICATION forming part of Letters Patent No. 638,717, dated December 12, 1899.

Application iiled April 24, 1899. Serial No. 714,270. (No model.)

To @ZZ whom it may concern: shown in Figs. 1 and 2, and communicate with 5o Be it known that I, WILLIAM D. HOXIE, a a chamber CZ, that extends to the base of the citizen of the United States, residing at New generator and opens into the ash-pit h of the York, (Brooklym) in the county of Kings and furnace. The direction of the air taken from 5 State of New York, have invented certain new the compartment A and conveyed to the ashand useful Improvements in Forced-Draft pit h through the duct D, pipes d, and cham- 55 Systems for Steam-Generators, of which the ber d is indicated by the arrows, as shown in following is a specification, reference being Figs. l and 2, and in the direction of the had therein to the accompanying drawings. waste products of combustion from the furro The invention consists in aforced-dratt sysnace to the uptake, (indicated by the arrows,)

tem for steam -generators in which air is as shown in Fig. 3. 6e forcedinto an air-tight compartment contain- In this system the air for combustion is ing a steam-generator, the air surrounding wholly derived from the compressed air in the generator being maintained under a presthe closed compartment and can therefore be I5 sure slightly above the atmosphere. The easily and efficiently regulated by suitable supply for combustion is directed and circudampers in the air-ducts and by the degree 6 5 lated from the closed compartment to the furof compression in the compartment. nace through ducts or tubes arranged within The temperature of the air may be reduced the boiler-casing adjacent to the course of the when heated above a desired degree by 2o escaping products of combustion. slightly opening or jarring the ash-pit doors Y In the accompanying drawings an embodiat the base of the generator or by admitting 7c ment of the invention is shown in connection air from the compartment by a suitable dewith a water-tube generator. vice at any other point in its transit through Figure l represents a plan view, partly in the ducts. 25 section; Fig. 2 a similar front view, and Fig. Heretofore in forced draft systems ar;

3 a sectional side view, of the generator and rangelnents have been proposed for supply'- 75 closed compartment. ing boiler-furnaces with air driven directly A is the air-tight compartment in which the by a fan along the heated surfaces presented generator is placed, B a fan-blower for forcby the boiler and into especially-designed 3o ing air therein, and C a Siphon-gage commuchambers adjacent to the iire-room,into which nicating with the interior of the compartment a portion of the boiler is projected, and into 8,0 and the outside atmosphere for indicating the chambers aflixed to the boilers adjacent to difference in air-pressure without and within the furnaces and air admitted to the latter, the compartment. both above and below the fire, by means of 3 5 The generator shown is of the inclined wavalves alternately operated, and I therefore ter-tube type inclosed within a casing in the make no claim to the saine; butIam notaware 85 usual way. that a generator has heretofore been placed In the present embodiment of the invention wholly within an air-tight compartment in an open air-duct D is arranged within the which air under pressure is maintained and 4o casing of the top of the generator, into which heated in a distinct chamber and from which the air-supply for combustion enters. This the supply for combustion is taken and by 9o duct D communicates with a series of Vertiwhich the defects of former systems met with cal pipes ct, arranged within a combustionin practice have been remedied.

chamber E, located at the side of the gener- What I claim, and desire to secure byLet-l 45 ator, which forms a passage for the heated ters Patent, is-

products of combustion from the combustion- In a forced-draft system for steam-genera- 95 chamber of the furnace K to the uptake H. tors, the combination of an air-tight compart- The vertical pipes a are fixed within this lment, into which airisforcedand maintained chamber E to partition plates or sheets Z1, as under compression, with a steam-generator in presence of two Witnesses.

VILLIAM D. HOXIE.

and an independent air-heating device,who11y inclosed in said compartment, the air-supply for combustion being transferred by means of suitable ducts or passages leading from the compartment to the air-heating device and 'from the latter to the furnace, substantially as described.

Witnesses:

OHAs. W. FORBES, GEORGE A. ROWELL. 

